Very Interesting Linux Events & Confs that you should be there:
Fosdem
http://fosdem.org
05 - 06 Feb 2011
Brussels, Belgium
Open Source Days
http://opensourcedays.org
05 Mar 2011
Copenhagen, Denmark
OpenFest
http://openfest.teipir.gr
9th to 10th of April 2011
Piraeus, Greece
Linux Open Administration Days
http://loadays.org
16th - 17th April 2011
Wilrijk, Belgium
Infosecurity
http://www.infosec.co.uk
19th - 21st April 2011
London, England
Fosscomm
http://fosscomm.gr
7th - 8th May 2011
Patra, Greece
Solutions Linux OpenSource
http://www.solutionslinux.fr/?lg=en
10 - 12 May 2011
Paris, France
Linux Tag
http://www.linuxtag.org
11 - 14 May 2011
Berlin, German
Desktop Summit
http://desktopsummit.org
06 - 12th August 2011
Berlin, German
FrOSCon
http://www.froscon.de
20st - 21nd August 2011
Bonn, Germany
FrOSCamp
http://froscamp.org
17 - 18 Sep 2010
Zurich, Switzerland
T-DOSE
http://www.t-dose.org
05 - 06 November 2011
Eindhoven, Netherlands